结构化设计（Structured Design，简称SD）是一个软件工程的设计模式，由爱德华·尤登及赖瑞·康斯坦丁提出。结构化设计是一个模块化设计，但着重模块之间的「模块层次」（module hierarchy）及模块和其他模块的交互。结构化设计常用在软件工程的结构化分析中。

Structured systems analysis and design method (SSADM), originally released as methodology, is a systems approach to the analysis and design of information systems. SSADM was produced for the Central Computer and Telecommunications Agency, a UK government office concerned with the use of technology in government, from 1980 onwards.